pan copy & paste with [cmd]+[c] / [cmd]+[v]

[FritzS - gmx]

Hi,
the only disability with pan I have, copy & paste with [cmd]+[c] / [cmd]+[v] 
don’t work. 
I must do this circumstantial with the right mouse bottom.

Gives a general way to use [cmd]+[c] / [cmd]+[v]  between Mac programs and 
MacPort programs?

Must I have to install or configure something else?

Greetings
Fritz